Your probably right, the quarter will probably be our smallest denomination coin and then they will stop the paper dollar. Next up would be to make the quarter out of plastic.
Way, way too expensive... considering the petroleum involved. They'll go one even better: The next quarter (and dime, nickle, $5, $10, etc) will be made out of bits. This will enable the Federal Mint to go into overdrive "printing" new bits of money.
Hey I remember paper and aluminum mills(worthless as a Missouri Mill) they made great washers to seal leaks on those porcelan pans we always seemed to have a leak in.
Obama wants cheaper pennies and nickels
http://money.cnn.com/2012/02/15/news/economy/pennies_nickels/index.htm