This is not impossible as sometimes there are projects that pay BTC and ETH in their bounty campaigns. But it is so rare that it comes twice a year or sometimes it never happens. But in my perspective I would rather accept a new altcoin that have potential to increase when their product was already done.
Yes, there are clearly some projects that make payments to participants in the form of BTC and ETH, but not all participants can participate in such projects, and I think projects that make payment methods in the form of BTC and ETH are also very good for us to follow, because such a project is not much like a project that makes payments in their own altcoin form.