Ergo, tighten up loose policy - stay with (or ahead of) the curve - and stop borrowers from digging in so deep at artificially low rates... 
I think you and I are saying the same things - though from a variety of angles... Wrt the Pomboy talk, I was talking macroeconomically.
This is the biggest issue I have with LC right now. I don't feel like they have gotten ahead of the curve; they are playing catch up with rates.
It may be that LC literally can't play catch up. For the sake of argument let's say there are now enough sources of unsecured personal loans such that competition between these sources forces rates to be what they are. LC raises rates too high and they lose borrowers to their competition. To go one step further, we can put the cart before the horse. LC knows their revenues required from loan originations to break even or make a profit. They have to set interest rates low enough to attract enough borrowers for revenues from originations to keep the company going. Of course if rates are too low LC loses lenders but that takes a while. They're between a rock and a hard place. Maybe they should think about some major cost cutting. Low cost suppliers are usually winners and LC doesn't strike me as a low cost operation (my speculation only).
I agree. I like LC's management, but the marketplace model is going to be seriously tested soon. In addition to your points, I'm not sure who will continue to buy the loans as defaults rise. Remember late 2016/early 2017 when almost all inst investor appetite for loans dried up? That could easily happen again. LC knows there aren't enough retail investors to support the costs of the model, so where would LC get its revenues? Even if LC begins to balance sheet loans, how much cash and how big of a credit facility will the company need to keep things afloat until buyers come back? Traditional CC lenders are also going to take it on the chin, but because they balance sheet their loans their revs/income aren't dependent on institutional investors.
Hopefully the c/o rates of 10% the largest CC issuers suffered in 2008-10 will be avoided, but I don't have any faith that the largest lenders can manage their risk properly. This is because all of the banks/lenders (including marketplace lenders) have been obsessed with growth and, again, are (historically) very poor at identifying macro risk that will damage returns. Or at least identifying it early enough and changing tack.
It all starts with the fact that top management and their staff at lenders are compensated for growth, not credit quality. And then the inevitable downturn comes, followed by high c/o's, then paltry earnings, and layoffs. Never mind what happens to the consumer or the small business, neither one of which should've been granted a loan in the first place. Granted, some borrowers do take advantage, but not most. I feel like we've all seen this movie before, but will the cycle ever end? Isn't there a better way?