I pretty much support Redbook opinion.
That is probably the same philisophy behind there legendary warranty.
Other company change their design on a regular base, a few year at most... And offer 5 year (limited and non transferable... ???) warranty. Since the desing chance every so often, they can't stock pile and pile of stuff to support it very long...
(This is the downfall of the digital line of product as well... Computer and digital related technology change at a rate that makes them impossible to support over long period of time...)
But Bryston design are rock solid and time tested and very well backed by the company.
And more to the point, it sound awesome...

And one day, I'm pretty sure the there will be a SST3 generation, but again, like James like to say, it will most probably be an "evolutionnary" step... Not a "revolutionnary" one...
But always wanting the "next best thing" makes you loose the present moment.
But just to take Soundgame point of view, it is deceiving to buy an expensive piece of hardware one day and that a new version arrive the next day...

(That is one reason for forum such as the present one! We can get a glimpse, and even influence a bit (as tiny as it may be) the direction of the company in regard to its priority in production evolution, etc.)
Take care!
AJ