Many of those assets were useless - like railways from nowhere to nowhere. Only some ended up being used.
And many innocent people ended up being hurt in the process.
Bubbles are not good. They are harmful. The ability yo recoup some of the losses in the span of next 15 years does not make the bubbles something positive.
Even railways from nowhere to nowhere often ended up being useful when the ends were extended to somewhere or when somewhere grew to encompass nowhere.
For example the Berlin Ringbahn was once some billionaire's toy but now it serves very useful traffic, as Berlin grew outwards to where the Ringbahn is.