Do you think there will be a Zatch Bell! anime remake or reboot someday?

No, there are no chances of a remake or a reboot whatsoever as this anime was never popular enough to warrant such attention. Especially if it would have to start all over again. There are plenty of far more popular anime that never got that treatment, so expecting this one to get it is beyond absurd.

They could, but only if the series has tremendous interest from the fans. What can they currently do to gauge the interest for the series is:

-) Reprint the manga

-) Re-release the anime in remastered form

-) Doing anime re-runs in the TVs

But remember, they only do remakes/reboots/continuing the anime IF the market is overwhelmingly positive for the series. This means all those 3 methods above needs to be cleared with flying colors, with no exceptions.

no, i don't think there will be a remake. while i have a huge soft spot for the show, for the longest time it was a weird memory because i saw it once on tv while on vacation, the series doesn't have the popularity. this isn't to say it's a bad series, but anime costs money and if you're going to be making a second anime for a show that already got one, even if it was imperfect, you need to know that it's going to make that back and more.

look at other series that got reboot anime, like hunter x hunter and full metal alchemist. their original anime series were successful and the manga were/are very successful, so they got expanded and perfected remakes. but with zatch, do most people even remember zatch bell? do people read zatch bell anymore? i'm sure some do but unless there's some resurgence in its popularity, a new anime series isn't likely

only tinne will tell, you'll just have to wait and see