The alternative, depending on your market segment, is your competitor do it and you don't, they fall behind for a little bit, your sales grow.

Then their version comes out, faster and better, and their dev team iterates faster, eventually catching up and leaves you in the dust. I've seen it happen...very recently, in a situation that ended up in large layoffs.

It doesn't have to be all or nothing though. These libs are easy to keep around side by side, so you can slowly rewrite stuff as you add new features until the transition is complete.