The 256bit EC key for each bitcoin address should provide comparable security to that of a 3072 bit RSA key.
I know 4096 bit RSA is popular now but it provides very marginal gain over 3072.
So why are bothering with PGP keys?
We could ditch gpg completely, electrum even has a usable command line interface for this.
Coinb.in also provides a signing and encryption.
It would be one less piece of software for noobs to learn about, we have to have the software anyways and it provides comparable security.
Picture it, put your wallet seed in your keepass db, make sure it has good security (90+ bits) and you're done, that's all you ever need.
And if someone should hit
gpg --list-keys
they wont get a list of your secrete keys, with probably marketplace names!
You thought there was blockchain congestion now?!?!