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>First observation, your client needs to make a decision not for the next 5 years, but for the 20 next years, and for this horizon you need to consider how the market will evolve at large, not just what is cool and hype today. In 2005, Flash and VBscript were leading, and in the end Javascript won.
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Hmmm...…..

With so many places needing to be agile in order to both survive and thrive, the notion of a 20 year plan is probably going to be as fruitful as the initiative for a paperless bathroom :)

In 20 years, you might have to do several major pivots - acquisitions, changes in process due to any specific industry regulations for your business, the loss of a key customer (or the interest in acquiring a new customer that would mean major changes at your end)

The best thing to plan for in 20 years is to be progressively more adaptive to change.

My 20 year plan? Not to die. :)