Welcome to the forum!
It must be of comfort to you that your post has attracted so many replies: your dilemma is not uncommon.
If you hold off on lifetime until you’re sure, you can be satisfied knowing that you are (still, nevertheless) supporting an outstanding (industry-leading) product and system with your subscription.
Assuming Roon ends up meeting your needs, which - as a (lifer) of three years use - I suspect it will, you can always opt in (for lifetime) and break even after about five years.
As you have probably seen, there has been extensive comment on these forums about what the future holds: one might have hoped that 95% of it would have been, “None of us can see into the future”. In fact, reaction seems to have included most likely schools of thought about what the takeover holds… and some unexpected ones.
I’m not aware of any quantitive survey of the hundreds of responses to the news.
But I have a feeling that the majority is optimistic. I know I am.
Good luck!