Bitcoin now is scalable and can adjust to network condition
Increasing max block size is not what "scaling" means. If you can process M transactions, and it takes N bytes, then processing 1000*M transactions by using 1000*N bytes is not "scaling". It is the simplest "linear growth" and has nothing to do with real scaling. The "real scaling" is called "compression". For example, where you can handle N-of-N multisig by using a single signature, instead of N signatures. Or where you can compress a chain of A->B->C->...->Z transactions into A->Z transaction, that is also scaling. And that is the right direction for the next soft-forks.
I couldn't have put this better! It will go in my list of bookmarks. This is what happens when people throw around words from a field they have no idea about.
It's clear that a block of twice the size has twice the space for transactions; so since the relation between size and transaction count stays the same, nothing was 'scaled'.