Solana (SOL) has dropped 50% in the past five weeks.The decline is attributed to market volatility, upcoming FTX estate unlock, and speculative frenzy in memecoins.Crypto asset manager Travis Kling warns about the potential unraveling of the investment thesis of 'owning the casino.'Kling also highlights the negative impact of memecoin speculation and mentions the potential bullish catalyst of the approval of spot Solana ETFs.