One of the posters above posted a link to an article suggesting 737MAX shouldn't have been grounded only the pilots to retrain them. The decision taken by China and subsequently followed by other countries was the correct one, because it gives an opportunity to look at all other processes as well and what can be improved.

Also, this will have Boeing's full attention now because I'm sure there will be airlines around the world watching this closely especially those with 737Max on order.

And with so much scrutiny now there will be no sticky tape solution for the interim. It will have to be a proper fix and they will have to wait for general release software rather than putting in beta software and praying it doesn't happen again.