Basic structure is foundation.
If it fails; then BBI can be salvaged;
If it sustained; it indeed become very difficult to ammend katiba.
But that was what kenya wanted in 2010 anyway.
They did not want something easy to ammend.
After the last one was ammended.
To ammend the katiba - it has to be a single amendment with rigorous civic and public participation - and a referendum for protected clauses.
And that is how it should be.
US constitution is 200yrs old. If every PORK came with 78 amendments - it would be something crazy now.