That may be the case on growth, but like when Microsoft favored AX, alot is probably coming at the expense of other products. I guarantee that if you called sage and said, 'hi, I'm interested in MAS90, or Peachtree', you'd get, 'sure, but your really want our flagship, X3, let me put you in touch with somebody' Microsoft does this with NAV, GP & SL. Microsoft did this because they like shiny toys and to them AX was shinier or and more techy than the others (forget the fact that it's way more complex to implement than the others). Sage will do the same, but not because X3 is 'shiny', but because (for now) Mr. Fucus is French and has so much pride that his French solution is moving to the head of the pack.
Plus, after they carpet bomb the channel like they did with MAS500, suddenly, after investing tens of thousands in dollars and lost time, and a few potential lawsuits after your first few implementation disasters and tons of write downs, you'll find that so many people were signed up, there are very few leads to go around. Then just as Sage settles in with X3 as the lead, Mr. Fucus will be sacked, and a new guy with a new 'favored son' will show up and you will all be left holding you 'bleep' in your hand like the poor souls that trusted sage on MAS500
It's not like X3 is such a magic bullet vs. the other 20 or so higher end ERP solutions in the same cost and implementation complexity range.