Ricci,
I don't think the keyboard manufacturers have a choice. If one of them does it, the rest will follow, and they lose.
If they don't and, as Jos mentioned, the Dell, IBM, Compact, etc. do it then they have to follow suit, and they lose.
If neither do it, then we'll do it ourselves, and they lose.
IMO the big three need to make good quality keyboards in various configurations, 88 key, 76, 61, and sell styles and sound fonts. Another possibility, is for them to come out with their own open system, with replaceable styles, fonts, and o/s which they will upgrade (for a fee). The hardware needs to be upgradeable as well. The first one do this, may well win the market share of business and become the standard.
IMO this will happen, because the technology is already there to do this. If it can be done it will.
Star
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I play Roland EM20 and Yamaha PSR550