it's pretty simple to replace the language. somali right now has a low literacy rate. barely any television shows that kids watch. the only exposure people are getting for the Somali language is by people around them. just by changing loanwords and introducing them with exposure, will not have a huge negative impact on our society.
you are exaggerating the amount of loanwords. Somali existed prior to the loanwords. Somali was fully functioning. Rendille is a Somaloid language that split round 1790- 2228. yet it is still a working langauge even while having next to no Arabic loanwords.
Rendille is an almost extinct language bro, different levels.
There are people in schools that use Somali everyday. If you have went to school in Somalia or talked to students back home, you will realise the amount of loan words for technical terms.
For those kids, if you change the language even by 10% overnight, you are going to impact their learning as they are not going to understand their teachers properly. They are going to have to teach them the new words before teaching them their syllabus.
Also, think about the cost of replacing all the textbooks, signs etc.