Is it a good idea to go all in on one ETF?

Hi, In my previous job i had RRSP matching with my employer. In total i have about 10k. Its with manulife. I left that job one year ago and Yesterday i saw that it has decreased $ISHARES S&P/TSX 60 INDEX ETF UNIT(XIU.CA)$ $VANGUARD FTSE CDN HIGH DIVID YIELD TRUST UNIT(VDY.CA)$ $VANGUARD INVESTMENTS CANADA INC S&P 500 INDEX ETF(VFV.CA)$