I heard most of the miners are shutting down their gigs, Is it true? So, Is this the end of Bitcoin? 
There was an article about miners in China shutting down their rigs and this has nothing to do with cost of electricity or difficulty, but this is more on the equipment itself reaching the lifespan where it needs to be shut down or replaced or else maintenance of such equipment will be more expensive.Chinese miners are always going to be the last ones shutting anything down. even if their equipment is outdated they simply upgrade it since they have access to fast shipment of ASICs from Bitmain which is in the same country and easy to access.
besides ASICs don't expire all at the same time! there was new versions released which made it less profitable to run the old ones so some started shutting down or upgrading. that shouldn't cause much of a hashrate drop in my opinion.
Make sense, a transition from an old miner to a newer efficient one. If there is a limited space, one must shut down his old miner first before implementing newer miner for an upgrade. It is possible once this upgrade is done we can see a rise of hash in the next days or week. I also heard that a new and more efficient miner is out so it is normal to see such a scenario. If mining is still profitable today, there is no sense to stop mining.