I read on some forums and facebook groups that mining bitcoin is not profitable now so they convert to altcoins mining. But it still depends on your specs, how much it costs you to build it and your monthly utility bills. Still profitable but I think mining altcoins is more profitable now.
Yeah, however the problem for that is if no one will continue to mine BTC, does BTC still continue to rise? Will it fall or be stable? Someone needs to continue mining BTC not because of their earnings but because of the production of BTC. But you are still correct, Mining altcoins is much better than BTC "alone".