Uncharted 1 & 2 available digitally on PSN, but are 20GB game downloads practical?

So with today's PSN update, Sony finally brought perhaps its biggest exclusive of this console generation to the PlayStation Store. Uncharted: Drake's Fortune and Uncharted 2: Drake's Deception are both available for $29.99 individually or — for a limited time only — as a $39.99 bundle.

The first thing I noticed was the staggering file size of each game:

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Those are massive downloads. I know PS3 Full Games tend to be larger than Xbox Live's Games on Demand titles since they're originally developed with Blu-ray's capacious storage in mind. But even so, if you opt for the bundle, that means you'd need to download 40 gigabytes to get started with both games. If you're a PlayStation Plus member and want to give either an hour-long trial, the same applies.

Maybe that's not a huge obstacle for those with a FiOS or DOCIS 3 connection, but anyone on a regular cable or DSL connection will certainly be in for a lengthy wait.

Do such hefty downloads defeat the purpose (and convenience) of full games being made available digitally?