HERETICAL OPINION : BTC vs CASH is THE WRONG COMPARISION when looking at BTC as an investment.

Cash hasn't been considered a thing to hold term ever (well, maybe before WW1, but, long enough).

So, BTC as CASH MONEY - that's a chat about LN (which I love, because, brilliant).

BTC as store of value, you need to compare against other actual stores of value. Gold, land, equities, baskets of lowish risk stuff.

Against that, if you take a "they won't win" view, BTC does well and should do very well until it fills it's natural portfolio niche, which, yes, pick a number between 250K and 2M and a timeframe of 5-15 years, after which, it should get boring and solidly inflation proof.