Seemingly, you seem to understand the problem better than the rest. Now can you name one person of similar calibre (a leader a politician scientist) who is capable of replcaing A.P.J. Kalam? With due respect to each of these big names you mentioned here, how can you compare someone who leads the nation to someone who is leading a team, a company, a factional group. The real world, specially because of its rapid changing and shrinking nature, values experience in diversified fields. Thats where A.P.J. Kalam is miles ahead of others. Think my friend think.