From my perspective, the price increase isn't that bad. Roon hadn't increased their lifetime subscription cost since it was launched over 4 years ago - if we only adjusted for inflation, it should be a good $60 or so more. So, taking inflation into account, maybe about a $130 real increase.
The product today is much more refined and has many more features than it did at launch. I understand it's frustrating when companies increase prices of products, but I don't think Roon's decision making here is different to almost all other commercial entities.
I don't see the lifetime subscription remaining available for much longer (as Roon have more or less said themselves.) For those who really don't like the subscription model and are convinced by Roon, I'd encourage you to act in the next few months - the sooner the better. I suspect we'll have numerous expressions of frustration when the lifetime subscription is finally grandfathered - don't be one of those people!
DOI: I swapped over to Roon a little under a year ago and did buy a lifetime sub. Even if I hadn't, I'd consider the increased cost of the lifetime subscription decent value for what we get.