I am afraid this trend has little to do with technology or customer convenience, and much more to do with the target economic model for the major content providers and controlling intermediaries in the supply chain.
With physical media, you pay ONCE and can view/hear it an unlimited time (as long as the hardware player does not break down, or the format is obsoleted ala HD-DVD).
With streaming, you first get used to pay for something you may not freely copy or exchange with anybody else, and then some time in the future you will get a notice that your "property rights" have got a limited validity date...
Every odd years, somebody comes with this "great idea" that instead of buying something, you could just "lend it"... for 60% of the buy value, or even better, for a yearly "maintenance" fee. That was the IBM mainframe economic model 40 years ago, that is still the current economic model for "enterprise software" such as SAP or Oracle : every 5-6 years, you pay your software a second time ! Mostly for the privilege of reporting bugs which should never have been there to the editor (and sometimes getting them corrected... in the next paid upgrade !).
What you learn early in economy classes is that paying in full once is always cheaper on the long term than borrowing/lending continuously, unless you have not the initial capital... or somebody forbids you the option of outright buying.
The trend for developing ever more "milking cows" worries me... as a cow