Crypto Index ETFs, Good or Bad?

The latest prospectus from T.Rowe lists these coins as eligible assets for their Price Active ETF just approved for launch by the SEC recently. (BTC, ETH, SOL, XRP, ADA, AVAX, LTC, DOT, DOGE, HBAR, BCH, LINK, XLM, SHIB, SUI)

https://www.sec.gov/Archives/edgar/data/2089855/000199937126013250/tknz-424b3\\\_062326.htm

Curious over time, how many other coins will actually be able to compete for inclusion in these ETFs over these more established coins?

Are the barriers to entry just too hard to breach and new coins won’t have a chance?

Are crypto index ETFs even a good idea? Or should filers stick to single coin ETFs and let the market decide the winners?