This will be very easy to do calculation like that

). I will be very happy if this will go this way. But, you need to look how payment was done in past and what amount you are receiving these days. We are dealing with increasing difficulty and therefore you need to understand that value is significantly lower now then in the June and will be even lower.
This is a trend:

The trendline is very misleading. It looks like we reach zero in few weeks

It is declining for sure, but using a linear interpolation is wrong. Looking at it, it is actually quite stable for the last few weeks.
In my opinion one should base an analysis on the last few weeks. A significant amount of the decline is caused by the drop of altcoin value again BTC. From my point of view the altcoin markets will stabilize on roughly the current level. Mining difficulty will most likely come to a halt as most people think that scrypt profitability is not good (I heard sales numbers from a larger seller of scrypt mining equipment; so I think I am right

. KnC and the like are far away (I would not expect them before mid Oct/Nov 2014 if they are ever released at all). Overall I am optimistic about relatively good results for the next 90 days.