Maybe if the limit was higher.  Payment channels still require at least one transaction per payment channel set.  How often are you willing to reset payment channels?  Once per week, once per month, once per year? The longer the period the larger the initial escrowed amount.  How many payment channels if the average user going to have. Say the average user accepts escrowing 6 months worth of future payments and has 3 payment channels payees each. That still requires 6 on block transactions per user per year.  2 tps @ 6 txn per user =  10.5  million users. 

Do you really think Bitcoin will be a global revolution with an upper limit @ 10 million users?

Payment channels, side chains, and cross chain atomic transactions are transaction multipliers.  They move us from one economic transaction per block transaction to more than one economic transaction per block transaction.  In essence they make the primary block space more efficient but you can't get any kind of scalability out of  1MB permanent limit.