The bitcoin blockchain code is the oldest but yet most adopted. In order to make changes everyone developers and miners need to agree on those changes and then almost force all miners to move to the new block chain. This has been a huge issues for many blockchains and we saw it most predominate this year when bitcoin and ethereum exploded in price and fees started to sky rocket.

Newer block chains address these scaling issues better now the issue now is trying to get bitcoin to that level. If the scalability issue can be fixed while keeping everything the same in terms of the infrastructure that supports bitcoin trading around the world then there honestly would be no stopping bitcoin.So if you ever hear and verify an update will fix the scalability issue forever then invest like mad! lol