being a great option at this point. He'd have to come waaaaay cheap for me to want to lock him in; honestly, aside from his torrid March-May of this year, he's *exactly* what you'd expect of Vogs. Alonso's yearly WRC+ (per Fangraphs) after becoming a full-timer in 2012: 108, 100, 93, 110, 87, 132(this year which, again, was heavily influenced by the first two months' uber-production). Certainly it's possible he's leapt a plateau, but his monthly WRC+'s for this year from May onward were: 112, 113, 108, 126.
I remember reading all about him in prospect lists, with the old memory banks spitting out phrases like 'pure hitter' and 'advanced approach' with 'the power will come' or variants thereof--basically the same we're saying of 'Bach.
So yeah, I wouldn't go in for Alonso on a big contract. A small one, that pays him as a 1.5-2.0 WAR player? Maybe I would at that, simply because we don't have 1B figured out now or in the near future. But if we're talking 2018, 'Bach (+whatever we could acquire for the difference in cash) vs. Alonso, I'm taking the former.