No monolithic blockchain, no matter how vertically scaled, can handle infinite tps. But infinite tps is what’s on the menu for mainstream adoption. 

WeChat and Alipay have had peaks of 500-700K tps. As has Amazon. Visa and Mastercard, 40-65K tps. High frequency trading can generate millions of tps.

It’s not hard to see that stacking up businesses will lead to 100 millions or billions in tps. And as we build out new ways of interacting on blockchains, tps will just keep going up.

There is no monolithic blockchain on Earth that can handle arbitrary tps without horizontally stacking instances, L2s, L3s, app chains, etc. in parallel for scale. 

Therefore we are best advised to prepare for a future of unquestionable, indisputable blockchain proliferation. The only question is which networks will parallelize most effectively in the long term.