> or is something competitive with a 737ng enough given they can pressure domestic airlines into buying it and undercut their way into more sticker price sensitive markets

Potentially, but previous attempts (like the Xian MA60 and MA600, which are derivatives of the designed in the 1960s An-24) have been very unsuccessful. It made some sales in Southeast Asia and Africa, but a few of those have had accompanying corruption/bribery allegations and investigations, and most have been grounded after serious incidents and troubles keeping them operating at reasonable costs.

But my overall point is, it's going to take them more than a decade, probably around two, to be able to churn out fully Chinese passenger jets in any relevant numbers. The Chinese airplane market is massive, so even then they probably won't be able to deliver enough. There also aren't any plans to get the C919, existing or future fully Chinese version, certified by EASA or FAA or anywhere else, so legally the jet can't even fly anywhere else other than China for now.

So we have at least 2 decades more of COMAC being very behind and churning planes at a slow rate, at best. And honestly, anyone who thinks they can predict the aviation market 2 decades ahead is out of their mind. We could have hydrogen powered flying wings by then!