I assume the OPs logic is that money will flow out of "banned" cryptocurrencies or at least the action of staking in cryptocurrencies that have this feature, meaning that money will flow back into Bitcoin, as it is not a staking coin. This logic is sound to me 
There's some logic in it when you think about how people often spread their investment into multiple coins. Some investors have 100k in crypto and 30k out of it is in bitcoin and the other 70k in various altcoins like ETH, ADA, XRP... If these get labelled as securities and/or get their staking banned these investors will probably move to other coins instead of leaving the market and going back to stocks or bonds. The crypto market would take a hit for sure but bitcoin's cap would increase. We all know that value flows from bitcoin to altcoins in bull market and the other way round in bear market.