It's all about saving money and time in the long run.
"By creating a one-way packaging option, Rehrig has eliminated deposit costs, tracking, and paperwork for brewers who own or lease kegs."
We'll all be "old school" in due time. I like SS for the durability and because I am use to using them.
Plastic kegs...well, I just can't seem to wrap my arms around it yet.
Time will tell...
You have to factor in the time and money. As in the recent thread "Should BrewPubs serve BMC", some may have to to survive. Doesn't mean everyone will respect or appreciate that. Breweries are having a real problem getting used kegs right now - especially ones that are worth a damn. And new SS kegs are E-X-P-E-N-S-I-V-E! I have a few SS kegs but, in my case, needed plastic kegs to supplement the shortage. I have a homemade keg cleaner - I could not afford the 15K brand new Keg Cleaner (though, its on the agenda, I assure you! Cleaning kegs is rather time and man power intensive).
So I can totally see how disposable kegs would be an attractive option. I can also see how they could have more impact on the environment - but I don;t know how much more. My guess is, less that a lot of people expect. Also, as I mentioned before, draft packaged beer is only something like 20-30% of all beer sales. The rest is ALL disposable packaging! So the disposable kegs are really just a drop in the bucket. And, if more people would take the time to have draft beer at home, or if restaurants could cut back on the amount of canned and bottled beers they serve and move to draft, and if disposable kegs helped to make this happen - then you may be talking about LESS landfill waste. Not more - especially if they are recyclable.
Like I said, there are all kinds of facts that are not being taken into consideration here. Even the weight of stainless steel kegs and the amount of energy it takes to transport them compared to the much, much lighter plastic. I haven't seen anyone who is opposed to the disposable kegs really give any facts, only opinions. Thats the only reason I said - someone figure it out.