I'll stop you right at the first sentence... open source. Your idea conflicts with the end result.
Open source doesn't mean people won't want to pay for it as a way of giving back. You see I don't stop easily my friend.
Let me add that having to connect to download to the client forces one to access sites that may be monitored. Also an act of network connection can lead to the compromising of a system, IP, IPS.
If clients were eventually available for purchase out of box with pre-established addresses, you could technically run (own) this box-client on your system without ever having to connect online, no downloads. Thus maintaining absolute confidence in the security of your system and funds. At that time the .dat file can be copied and used on other computers or if needed one can then connect online and know one's computer is fresh and no data exists on it that could compromise your identity or location. Just a thought...
As for fairy tales, one of my favourite tales was written by Jules Verne and concerns men walking on the moon.... Just a thought... Thanks.
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What about using Tails Linux
https://tails.boum.org . Get the Linux wallet run with it, and you have got yourself a decent 'plug me anywhere my drk wallet' system. Put a bittorrent sync client on it and have the wallet.dat file synced to a secure place just in case, optionaly of course.