This would clog the network , they actually considered this before .
Too make it feasable there would have to be a button to re-search every X mins and auto-download the best result .

The minimum time for that re-search would have to be atleast 10 mins .
Else you will overload the network with query's and results .

And the "best result" should be able to be spicified by the user .
For example the best result is :
A) biggest file
B) fastest connection
C) best matching to initial search keywords
D) ...
And the user could shoose from that .

This basicly makes it posible to start a search and come back 3 days later and be sure you have the desired file .