I think it may go on for... well up until next year? or the year after.. xD
Well it will most certainly not end this year.. there is a lot more characters and we only have three month's left worth of song's..

It might last until next year.. .......
................................................................... or the year after.. XDDD

I congratulate Happy Elements...they must be doing really well to do this.. maybe even bigger than Uta no Prince Sama.. <33