I think yes now it is more profitable to mine altcoins and to convert them to bitcoin as now we can see that the price of bitcoin once again started to increase, but still if we are mining some altcoins which have the potential to increase more faster then we should have to keep them also.
I mined the Etheruem in the past, it was very profitable for me. But now, it is get less profitable day after day.
Even though the Ethereum mining difficulty is rising, it is more profitable now. It is mainly due to the higher price.