Subject: Can 'Junk' DNA be a mechanism to enhance the probability of gene survival?

Apologies if this is a repetition of a question already asked but I did not see an exact answer to my 
question.

Is it plausible that, since mutations occur at random in the genome, having 'useful' genes occupying a 
small percentage of all the DNA would ensure that the probability of a mutation affecting them is much 
smaller than if they appeared contiguously in the genome? This would be a mechanism that contributes 
to hence gene survival through the generations.

Re: Can 'Junk' DNA be a mechanism to enhance the probability of gene survival?