There is already a problem with Fees. They are really low, and have been really low for the past 2 weeks at least, this means something is going on.

EIP 1559 is going to reduce fees at least 50% so you can expect a drop in your income near to 50% less profit.

So basically: a 3070 makes around 5$ after electricity, but it will go to 2,5$ in just two months.
Do the maths. You are NOT GOING TO BE ABLE TO ROI by the end of the year and then, ETH is going full PoS so you'll not be able to mine.

So its an obvious NO.

In fact, it's an obvious NO for almost all new gpus out there.