Dare I hope?

There's no chance of them changing the nominee, of course, but Ron Paul delegates (now disproportionately higher than their original votes because of their clever tactics at state and county conventions) could be the swing votes on deciding platform planks (voting with the conservatives on economic issues and the moderates on social issues) and thus nudge the Republican Party platform in an overall more libertarian direction.
Ron Paul's forces quietly plot GOP convention revolt against McCain

In the last three months, Paul's forces, who donated $34.5 million to his White House effort and upward of a million total votes, have, as The Ticket has noted, been fighting a series of guerrilla battles with party establishment officials at county and state conventions from Washington and Missouri to Maine and Mississippi. Their goal: to take control of local committees, boost their delegate totals and influence platform debates.

Paul, for instance, favors a drastically reduced federal government, abolishing the Federal Reserve, ending the Iraq war immediately and withdrawing U.S. troops from abroad.

They hope to demonstrate their disagreements with McCain vocally at the convention through platform fights and an attempt to get Paul a prominent speaking slot. Paul, who's running unopposed in his home Texas district for an 11th House term, still has some $5 million in war funds and has instructed his followers that their struggle is not about a single election, but a long-term revolution for control of the Republican Party.