HubSpot, like many other CRMs, is not one-size-fits-all. In fact, HubSpot, to a greater extent than say Salesforce, has extreme limitations when it comes to its CRM. In other words, there are scenarios the HubSpot CRM simply wasn’t built to accomodate. De-evolution (or reversal) of the Lifecycle Stage is just one such scenario.
In our experience, the best solution is an accountable team aligned around uniform objectives. In our world, we don’t separate sales and marketing -- because one cannot truely scale and remain competitive without the other. At least not in an evolving 21st centry buyer-centric sales environment.
>>“When a potential sale is lost … Should the contact be therefore a SQL?”
Yes. In our world. But only because [we do NOT allow deal creation to FORCE the ‘Opportunity’ Lifecycle Stage] and because of the definition of an SQL that we use internally -- i.e., a lead with the capacity and willingness to pay for our product &/or services, and who has expressed interest in US after reviewing our offerings -- i.e., emailed us, or scheduled a meeting with us.
- Notice how our SQL definition doesn’t say whether or not … they’re new, have a deal in progress, been connected with, etc.
- Notice how that definition doesn’t say ‘ready to buy’. (an important distinction in my mind)
- Notice also how it doesn’t include people who subscribe to some blog, who’ve downloaded some ebook, or who’ve completed some contact form. These tactical tools are not true indicators of sales readiness, but are mear micro-conversions along the way to sales readiness.
The ‘Opportunity’ Lifecycle Stage in HubSpot is tied to deal creation (by default). However, this default behavior can be disabled.
In a scenario where deal creation is being allowed to promote the Lifecycle Stage to ‘Opportunity’ (by default) we would recommend maintaining that Lifecycle Stage and using a customized Lead Status to identify the lead’s current state of readiness. (see further explanation and image later in this thread)
Think of it like this …
Last year we spent close to ~$150 per client acquisition. The bulk of those costs came from QUALIFYING LEADS. So, for argument’s sake, let’s say we opted to do away with the lead qualification process and Lifecycle Stages, and simply just meet with everyone who had a question. Since we use to do things this way in ‘the old days’ (2012) we have excellent data around how well it works by comparison … it doesn’t.
Why? Because we’re in the service business and our most valuable resource (time) is finite.
The decision to build a sales funnel to pre-qualify leads dramatically reduced the NUMBER of leads that crosses our desk, but it also dramatically increased the CONVERSION RATE for the remaining leads. Some would call these the ‘Glengarry Glenn Ross’ leads. (from the movie) 
Something else it did was INCREASE THE VALUE OF EACH LEAD! (shutup) Nope. Seriously. Think about it. If we’re pre-qualifying leads -- (our model) -- that means we’re effectively turning away people who may have otherwise turned into buyers with just a little ‘convincing’, cajoling, or whateverthehell -- (long story for another time, but not our model).
Point?
Once we qualify a lead internally as an SQL, they NEVER become unqualified unless / until they explicitly express disinterest or die in the CRM through attrition. (aka: list decay)
Why? Because we continue to provide value to them even if they’re not our client -- via follow-up emails, via this forum, via free calls, etc.. In other words, we don’t stop the sales process for SQLs simply because they’re not ready to buy TODAY. If we did that we’d be out of business in less than a year.
This model works for us because our target buyers evolve in both their careers and in their HubSpot expertise over time. They realize that marketing is only getting harder and more complex, so they will eventually need help navigating the evolving HubSpot terrain. On more than a few occasions this has translated into month’s old SQLs re-engaging us even after moving to other companies.