It's 1996, and we have 1000's of currencies.... That we don't need.
It's a game of musical chairs. We don't need 30 privacy coins. Maybe we just need 4 or 5.
Just don't invest in 30 coins. Buy 4 or 5 promising coins you want. Honestly saying, nobody knows, how many coins do we need now. This question is being solved by the crypto exchange markets in the real time.
The most important thing to do if you're new to crypto is to ask these questions:
1. Does this coin solve a massive problem?
2. Is the team incredible?
3. Is there a decent following?
4. Has this coin been audited for security issues?
5. Was there a shady premine or other red flags?
I think the pre-mine doesn't matter a lot. For example, take a look at Ethereum. 72 million coins were pre-mined in the first block of its blockchain, but in spite of that this crypto currency is highly demanded by the people conducting an ICO campaigns.