'will be appreciative' is correct and usable in written English.
This phrase is used to express gratitude. For example, "We would be so appreciative if you could help us out with this project."
The rest of the driving public will be appreciative.
If Monkeyworks is representative, fellow recruits will be appreciative.
Which is not to say everyone in the audience will be appreciative.
"Small businesses will be appreciative of the integrity of the president's leadership," Mary Crawford, the Commerce Department's public affairs director, said on one panel.
Although readers won't find Arial (the favorite default sans-serif on the computer) or Zapf Dingbats (the most commonly used typographic ornaments, at least on the Macintosh), they will be told about the calligraphic and engraved origins of the Western alphabet, particularly the Roman letter, with such clarity (and a touch of raciness) that even the novice will be appreciative.
Recipients of the information will be appreciative, as you are providing a useful service to them.
If you supply your audience with content they value, they'll be appreciative and more likely to listen to you in the future.
They will probably be appreciative for a few days — and then things go back to normal.
"I got my chance because of him, so I will always be appreciative of that," he said.
"I hope [Leno will] be appreciative if we make the point that his comments are constitutionally protected in the United States under free speech and, frankly, they appeared to be satirical in nature," Ms Nuland told reporters.
Of course many companies without designated schemes will generally be appreciative of some security support.
