Yes. The only way to answer that question accurately will be in 10 or 20 years.
There are quite a few historical examples of appeasement not working out long term.
Chamberlain was hailed for "peace in our time" after giving up czechoslovakia in the Munich Agreement. We know how that one ended.
That was also 7 years before the first nukes. Like or not the dynamic has changed. De-escalation should always be goal #1.