The total number seed phrases are 1,329,227,995,784,920,000,000,000,000,000,000,000 - if I right counted - 12 words.
Yes is very much, as seems.
But let's regard - there is a thief and he wants to steal money from anybody.
I focus accent on the words
I.e. thief's target is to find the first address with money.
And that large number doesn't seem so much.
Also bad that the dictionary base is opened to everyone. A thief can use a brute-force attack and get the first address with money.
And if we understand seed phrase include many addresses, that make the task for thief easier.
I understand the 13 or 25 words, it's created by me, and they are known by no one. It means that security is more, more, more better.
Anybody can say what number of seed phrases are used now?
Do developers of the network think about what happens later? And need whether to think about this problem at all. Can be I see this problem in the dark.