If we are to think about Bitcoin in the long term, and given Bitcoin's reasonably critical economic mass of ~$5 bil, current temporary block subsidies can be discounted as we consider fundamental questions about how and when to change one of Satoshi's Holy Numbers.
To which holy number are you referring?
One last question: what's your position on block size limit, never change it or change (in the way you like the most) in the future?
I agree with Satoshi, change it "eventually" sometime in the next ~5 years (after optimization by sidechains/LN and fee markets mature).
"Eventually" will be when we see actual congestion (competitive fees no longer prioritizing tx) or the network otherwise being harmed by the Holy 1MB crapflood regulator.
Accommodating more 'cosmic background spam' with a permanent home in the Mother Chain is the worst reason ever for increasing blocksize.