I love food trucks, I like the excitement they have brought downtown and to other neighborhoods around town. I actually think they bring more net foot traffic to downtown and help to further establish it as a vibrant dining destination full of choice. I'm not in the restaurant business so I can't say if some businesses have seen their sales negatively impacted by their arrival or not, but I haven't heard of anything so far. If anything I've heard that they've been great for business. More reasons to come downtown, are always welcome.
I think a common sense adjustment to the on-street parking policy seems perfectly reasonable. As a city we should be open to new ideas and change where it makes sense.
However I should note, lost in this discussion is the fact that restaurants aren't the only storefront businesses in downtown, nor the only intended users of said meter parkings spaces. I actually think my industry (retail) might potentially suffer more than restaurants would in an overcrowding/blocking the storefront scenario (which we are obviously nowhere near). There are a couple spots outside our storefront that are very popular with our customers, and if we were to have food trucks use them during our peak hours I'm absolutely sure our business would suffer. But there are also plenty of other spots were it would actually be pretty benefical to us.
Given that there are still a lot of vacant storefronts downtown and hours when storefronts are vacant I think we have plenty of options to work with everybody.
To me the question isn't whether Foodtrucks are good or bad, but rather how do we accomodate their needs and our needs in a mutually benefical way. I think it's very doable.
Bring 'em on I say.