After the 797 what numbering scheme?

[KDSM]

is Boeing going to use?

[C]

No one knows. Boeing don't know. The 797 (if it ever happens) will not appear until around 2019 going on current time between developing major types.

Second thread down in the Specific Aircraft Types forum:

http://www.simviation.com/cgi-bin/yabb2/YaBB.pl?num=1181921596

[Jakemaster]

If I was to bet on it, I'd say they just give 'em names.  The 787 Dreamliner is the first Boeing jet to my recollection that actually has a Boeing given name, the 747-8 is the Intercontinental.  They might just give em names (like the comet etc) and a model number (model 200, 300, 700, 800 etc).  

[chiptas]

Jake may be right like when intel changed from numbers to names,but they did it because you cant copyright a number.

[RitterKreuz]

Thats it... 797 is the last one.

after that its the apocalypse. sorry. have a nice day  ;D