"dramatically ramping up key sizes" is not done, because it's overly expensive, and not needed.

What people don't realize: key size recommendations are surprisingly stable over long timeframes, and have not changed for a very long time. In the early 2000s, some cryptographers started warning that 1024 bit RSA is no longer secure enough, and in the following years, recommendations have been updated to 2048 bit minimum. That's now been a stable recommendation for over 20 years, and there's not the slightest sign that 2048 bit can be broken any time soon.

The only real danger for RSA-2048 is quantum computers. But with quantum computers, increasing your RSA key sizes does not buy you much, you have to move to entirely different algorithms.