An interesting observation - Boeing's future

Twenty-seven years - Rand Simberg at Transterrestrial Musings offers this tweet and conversation.
The excerpt that started it:

Pushing an all-new 797 to 2035 would put its arrival to market 27 years after the 787 was first supposed to go into service in 2008.

For comparison, over a 27-year period in the last century Boeing developed the 707, 727, 737, 747, 757 and 767.

Quite the productive timeline.  Now? Resting on their laurels? What IS their future?