and why you call it "frozen" bitcoins / alt-coins? they just do not merge into other coins, so lower / higher amount of fees related to the block size may be needed to get processed. market will find its way.
If I want to buy something for a hundred satoshis, and I only have an indivisible note for 1.358154 bitcoins, and the seller only has indivisible 3.5784565 bitcoins for change, then our bitcoins are frozen and we will not be able to complete the transaction, while normal bitcoins could always be used to pay.