The Aero 8 came along and people still bought the Trad. The Plus Six will not stop people buying the trad as it is very different. I hope it attracts a new range of buyers as the Aero8 did 18 years ago. They are not mutually exclusive or at the cost of the other from my viewpoint.
I am certain the team have considered the future as we have all speculated on several other threads.
Today CX chassis with TurboIL6 Trad (various) M3W
Perhaps Tomorrow CX with Turbo IL6 to rget CX with Turbo IL4 to reduce cost in many markets but still more expensive than Trad CX with Turbo IL3 as above (emissions)
Very probable
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Trad to get Turbo IL3 as engine ranges consolidate Trad to get Turbo IL4 as sporty model with lower emissions for other markets.
Some time ago I was told a turbo charged engine in a trad was not possible, but none the less is has been done
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M3w to get Plus Six engine - didn't you ever see Honda 1986 CB-X 6 cyl!