I'd say it's more the manager isn't very capable. The team showed they could play well against Hungary and Ireland, but for the second consecutive tournament, have gone out way too early, Belgium will see this as HUGE opportunity lost, due to the easy nature of their side of the draw, avoiding Spain, Italy, Germany of France, the four favourites.
Given the right manager, they could easily win the lot in Russia.
As for Witsel, why can't we have him AND Schneiderlin? The RS signed Mane for £36m, we could sign two for £50m?