Your beautiful point can be elaborated through many other verses and in great detail.
In the following verse, Allah did not say: Don't worry, We will send another Messenger after him.
3:144 Muhammad is only a Messenger. The Messengers before him have passed on. So, if he died or were slain, would you turn about on your heels? .....
[The System the Prophet has established is to become a beacon of light for all humanity. The believers will reap the fruit of the Benevolent System here and, then, get rewarded in the Hereafter. 3:101, 3:185, 35:10]