As AH says it's been happening in Europe for years - it's here to stay I think.
After the turmoil of 2007 pilot recruiting boom all airlines will want to have a bit more control on the entry and exit of their workforce, and what better way to do it than with an extensive training/selection process at the start, and a six year bond to follow through.
There will always need to be a "direct" entry route since the lead time for cadets is so long, but I can see cadets making a decent percentage of annual pilot intake numbers.
The ACP isn't much more than the endorsement cost anyway - and would make it an easy career jump from GA Baron to A320, bypassing the regional airlines on the way...