It's hard to accurately measure adoption level mostly because of the decentralised nature of Bitcoin, but looking at the transaction volume is a really bad approach. One individual sending money back and forth can generate tremendous volume (similarly with exchange moving their funds between hot wallet and cold storage). Same goes for transactions count (if you are moving big enough funds you don't have to pay fee), plus there are things like satoshidice or reddit tip bot that tend to move towards off-blockchain transactions now.

That looks like the price spiking and lots of trades happening, or alternatively a major individual player moving their coins around.

It definitely says nothing about consumer adoption.