I think the question whether the US loans are diverting capital from the non-US loans can be pretty easily answered in the affirmative.
Ah, but can it?...

Based on other people's calculations, I would think not.

First, I believe the bottom line question on this issue is, "Have any non-U.S. loans gone unfunded?" The answer to that one is, "Not yet."
So, the diversion question as a causative reason for something that hasn't happened is secondary. Still, it's worth considering.
One way to look at this is in terms of "the pie." "Is the slice of the pie for non-U.S. loans getting smaller?" Of course it is. There wasn't a U.S. slice at all until this month, so the other slice went from all of the pie to the rest of the pie.
So, this part of the question isn't so much about are the non-U.S. loans getting less of the pie, but, "Are the non-U.S. getting less pie than they need?" As long as all loans get funded, the answer to that question is, "No." That's the real bottom line question and answer as far as I'm concerned.
A related question from the introduction of U.S. loans goes something like this, "Is the pool of available funds for loans growing since the introduction of the U.S. loans?" My preliminary answer to this is, "Yes!"
Thanks to the work of Sherry and Ian, we already have some numbers to check that out.


Looking at the Kiva Daily Loans transactions for this year, we can see the jagged line for June 10 forward stays pretty much between $200,000/day and $400,00/day. That's quite a bit above the $100,000 - $300,000 daily squiggles for the month's just before the introduction of U.S. loans.

The sawtooth pattern of Kiva Loans Outstanding for this year shows a steady growth a the top end, meaning the Kiva loan portfolio (the pie) continues to grow.
So, daily lending has increased, the pie is growing, and no non-U.S. loans have gone unfunded. My conclusion from these verifiable facts is that the gloom-and-doom predictions from Kiva introducing U.S. loans do not seem to have yet occurred.