As I've pointed out repeatedly in this thread, comedy trailers, by and large, tend to suck out loud.
Edit:
Boom, there, you finally admitted it -- because it's not the nostalgia trip with a bunch of sexagenarians that you want, that's why the movie will suck. Was that so hard?
No, it's because that would possibly bring the film more success and keep the franchise alive. And it's an idea that others seem to have had, according to rumour, even Sony themselves are considering such an approach. I would have been happy with a continuation of the story via a handing of the torch, I would have been happy with a good remake or reboot, including one with this exact cast. Signs are not promising however, and I dislike the design work.
I wouldn't be so ageist as to assume 60 year olds couldn't make this kind of film though, as that in itself, is something that makes for fine comedy. And Indiana Jones 5 is going to be a thing.
So no...I want this to be good, or I want it to succeed enough that the next film will be better. A bad film kills that prospect. Anything that improves the chances of making more people go to see the film is a good thing. I think a surprise 'its a sequel after all! Look They're Back!' might prove to be popular in this instance.