Considering they kept says 2025 for months and... well not surprised.
Any fantasy that Hillary may have of stringing this out until the Convention in Denver is going by the way-side in early June, no matter what Bubba may be telling her. You will see her recognize this inescapable fact and bow out in early June.
The Supers simply don't want to wait 3 months while John McCain piles up an insurmountable lead, simply so that Hillary can have one last savage run up the mountain, rolling that stone uphill for all she's worth.
They are ready to end it and they will end it by moving to Obama in massive numbers by the end of June at the latest. A lot of them are only waiting until May 20 to have some political cover to come out for Obama.
Meanwhile the negative publicity on Hillary in the press and among party members would be astronomical if Hillary tries to tough it out. If she thinks things are hot NOW this is NOTHING to what the incoming fire from every angle will be like by July 1, if she just goes to ground in the bunker and tries to stave off the storming of Berlin. The press, just for starters, will be absolutely merciless.
You are seeing the hand-writing on the wall when George McGovern defects.
The hand-writing says: "Mene, Mene, Tekel" BTW: "You have been judged and found wanting."
According to DemConWatch's numbers, Obama has 1712.5 delegates right now (if Obama gets Michigan's 55 uncommitted delegates and the 67 he won in Florida's primary) That's gotta be Hillary's best case scenario (unless she really thinks that Obama won't get any of Michigan's uncommitted delegates).
Thus, if Obama's predictions stand he will have 1776.5 by May 20. (I do think he's a bit too optimistic in KY and WV, though). That leaves him just 7.5 delegates short of your standard of 1784 pledged delegates. So in Hillary's best-case scenario (and accepting Obama's predictions), Obama will clinch the nomination either on May 31 (if the Committee accepts any solution other than Hillary's best case) or on June 1 when Obama will surely win the 7.5 delegates he needs to get to 1784.
I think the best you can argue is that Obama will call the race too early by 1.5 weeks because he's short 7.5 delegates. That's a little nit-picky, dontcha think?