Will it be brief? No, it will escalate first. It will escalate because Iran responded.
US-Israel attack on Iran: Tehran launches retaliatory strikes as Trump says ‘major combat operation’ under way – live
https://www.theguardian.com/world/live/ ... ve-updates
Of course they did. Presumably everyone knew that before it was triggered.
Who is meant to benefit? We could try answering that now, and then we can look back later and see how close the outcome came to the intention.