Sure. But, selling a mid gen upgrade machine is of no value unless it 1) brings new people into the ecosystem, or 2) gets the people that owned the original version of the system to buy more software. Basically, selling the systems does nothing good unless they drive additional software sales. So, if XBX sells 10m units to people that already own XB1 and they continue buying three games per year, MS accomplished nothing. If Sony sells 10m PS4 Pro units to people that didn't own a regular PS4, and those people go on to buy some software, then Sony gets some benefit.
We don't have enough information (at least, I don't) to know how those possible scenarios played out.