The Ions arrival, design and marketing can be looked at from a couple of angles...
Firstly, great price for great performance, leading to semi-blowbacks having a demand drop. Second hand market affected slightly, although i dont see how it will be affected too much...i.e:
if i have 500 quid to spend and i could chose between a second hand timmy thats the nuts or an ion + a few hundred in my pocket as spare cash i would still go for timmy... but i suppose thats just personal preference.
Secondly, its the aftermarket parts manufacturers (sp) that seem to have/will benefit the most... just go on the ion owners group forums and all they seem to be ranting about is upgrading this and that!
Removeable body shells was a marketing/sales masterstroke from SP... though they dont seem to have been exploiting it that much...
The ion seems to be a gun that a person will buy, then upgrade like mad!!!
For some reason i just know that if i bought one i'd try to upgrade almost every bit on it, perhaps pushing the total investment into the marker to over £450+... the cost of a decent second hand gun that may perform just aswell or out perform it.
Just my thoughts