Interesting idea that has merit, but I don't think it will ever happen, the 911 is positioned to be the top dog, they (Porsche) won't change that.I wouldn't put de-tuned engines in the 718s. The 911 platform and the 718 platform are fundamentally different (just physics). Let buyers select the platform; each has their pros and cons, but don't play games with the engines just to protect one platform. Of course I'd have to increase the price of the 718 to match the 911 with the SAME engine. The 718 shouldn't be an "entry level" car, just a different one. Just my $0.02.
Fortunately for me I have never wanted a 911, give me the mid-engine chassis and all it has to offer, Porsche knows they have one of the best 2 seat sports cars out there and now that the 992 has become more of a touring car the choice is actually clearer, the 718 is what a drivers car should be.