They have touted for a long time their false equivalency that restriction equals security. If they backtrack on that (I believe) they believe they will lose customers. In reality their fanbase will likely stick with them because that’s what they know and the added functionality will make their offerings a more appealing product.
Now that Europe is forcing their hand on some of this we can see the impacts it will have on their market growth in the coming years. There are other factors that impact this potential shift in market share too:
Is your current phone still working
Have you had a lot of problems with your current phone or phone manufacturer
Are you willing to ignore Apple’s past regresses in anticipation of actually being able to use their hardware as you wish